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If the protection action is set to LIMIT, the PLZ- 4W sinks current as a constant-power load at
point B. Even if you attempt to decrease the resistance to increase the current, the current
will not increase beyond point B. If you increase the resistance to decrease the input current,
overpower protection (OPP) is cleared. The PLZ-4WH returns to constant resistance (CR)
mode, and the operating point moves along segment AB.
Transition of the operating point: overcurrent protection (OCP)
If the overcurrent protection (OCP) setting I
when the PLZ-4WH resistance is decreased (R
current) increases, with the voltage of the constant-voltage power supply at V1, the operating
point moves along segment AF (A
(OCP) is activated.
At this point, one of two types of operations occurs, depending on the protection action
setting for OCP. If the protection action is set to LOAD OFF, the load turns off.
If the protection action is set to LIMIT, the PLZ- 4W sinks current as a constant-current load at
point F. Even if you attempt to decrease the resistance to increase the current, the current will
not increase beyond point F. If you increase the resistance to decrease the input current,
overcurrent protection (OCP) is cleared. The PLZ-4WH returns to constant resistance (CR)
mode, and the operating point moves along segment AF.
PLZ-4WH
The load is turned off (no current flows).
LOAD OFF
The PLZ-4WH stops operating as a load.
Point B
The PLZ-4WH switches out of constant resistance (CR) mode.
LIMIT
Overpower protection (OPP) continues, and the PLZ-4WH
operates as a constant-power load.
Operating area
Constant current line
F
A
A
A
1
2
V1
R
1
R
2
R
F
I
OCP
Logarithmic scale
Input current [A]
1
The load is turned off (no current flows).
LOAD OFF
The PLZ-4WH stops operating as a load.
Point F
The PLZ-4WH switches out of constant resistance (CR) mode.
LIMIT
Overcurrent protection (OCP) continues, and the PLZ-4WH
operates as a constant-current load.
(OCP setting)
OCP activation point
B
Constant resistance line
(constant resistance settings: R
I
B
is less than the current value IB at point B,
OCP
→R
→R
) so that the input current (load
1
2
F
→A
→F). When point F is reached, overcurrent protection
2
Operating Area
, R
, and R
)
1
2
F
App.
141
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